print all c code in this folder

printallccode.sh

#!/bin/sh

TARGETFILE=allinone.c

if [ -e "$TARGETFILE" ]; then
    rm -f "$TARGETFILE"
fi

if [ -n "$1" ]; then
    printf "$1""\n" >> "$TARGETFILE"
fi

printf "%s\n\n" $(pwd) >> "$TARGETFILE"

for filename in $(ls | sort)
do
    if [ "$0" != ./$filename ] && [ "$TARGETFILE" != $filename ]; then
        printf "******** %s BEGIN ********\n" $filename >> "$TARGETFILE"
        cat $filename >> "$TARGETFILE"
        printf "******** %s  END  ********\n\n\n\n" $filename >> "$TARGETFILE"
    fi
done